Details

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BUY FJ3121AH red(8pcs) https://www.utsource.net/itm/p/12594792.html

Parameter	Specification
Part Number	FJ3121AH
Color	Red
Quantity	8 pcs
Forward Voltage (Vf)	2.0V to 2.2V
Reverse Voltage (Vr)	5V
Continuous Forward Current (If)	20mA
Peak Forward Current (Ifm)	80mA (1/10 duty cycle, 100μs pulse)
Viewing Angle	140°
Wavelength	625nm ± 10nm
Operating Temperature	-40°C to +85°C
Storage Temperature	-40°C to +85°C
Lens Type	Diffused
Package Type	Through-hole
Dimensions	5mm diameter x 2.1mm height

Instructions:

1. Mounting: Ensure the LED is mounted correctly with respect to polarity. The longer lead is the anode (+), and the shorter lead is the cathode (-).
2. Current Limiting Resistor: Always use a current-limiting resistor to avoid damaging the LED. Calculate the resistor value based on your supply voltage and the desired forward current.
3. Heat Management: While these LEDs are designed for standard operating conditions, ensure they are not placed in areas where heat can build up excessively.
4. Soldering: Use appropriate soldering techniques. Avoid overheating during soldering; do not exceed 300°C for more than 10 seconds.
5. Handling: Handle with care to avoid damage to the leads or the lens. Use anti-static precautions to protect against ESD damage.

(For reference only)